Statistical Methods for Interpreting Spatial and Temporal Heterogeneity of Martian Tropical Water Ice Informed by Properties of Crater Ejecta Types

IF 2.9 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Earth and Space Science Pub Date : 2024-11-18 DOI:10.1029/2024EA003796

Jamie D. Riggs, Michelle R. Kirchoff

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引用次数: 0

Abstract

The martian tropical water ice spatial and temporal distribution was characterized using impact crater ejecta type, location, size, and age in one of two epochs, $\leq 3.4$ Ga and $> 3.4$ Ga, using statistical models designed for spatial and temporal correlation structures. The indicator thought to identify the presence of ice is craters with layered ejecta, while the indicator thought to identify no ice is craters with radial ejecta. These indicators imply the location (longitude and latitude) and, potentially, depth (crater diameter as a proxy) of ice, and when the ice was present. The spatial and temporal distribution of layered ejecta versus radial ejecta may inform on the geography and evolution of ice. A statistical spatial point analysis was conducted on a 54-sample data set (craters with diameters 2.77–10.00 km) for an equatorial region ( $0 °$ to $- 30 °$ S, and $10 °$ E to $340 °$ W. The analysis shows the spatial and temporal distribution of tropical ice in the study region is most likely random.

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根据陨石坑喷出物类型的特性解读火星热带水冰时空异质性的统计方法

利用≤ 3.4 ${\le} 和 > 3.4 ${ >} 3.4$ Ga两个时代之一的撞击坑喷出物类型、位置、大小和年龄，描述了火星热带水冰的时空分布特征。3.4$Ga和 > 3.4 ${ >} 3.4$Ga，使用了针对空间和时间相关结构设计的统计模型。被认为可以确定存在冰的指标是具有分层喷出物的陨石坑，而被认为可以确定没有冰的指标是具有径向喷出物的陨石坑。这些指标意味着冰的位置（经度和纬度）和可能的深度（以陨石坑直径为代表），以及冰出现的时间。层状喷出物与径向喷出物的时空分布可为冰的地理分布和演变提供信息。对赤道地区（南纬0°$0{}^{/circ}$至-30°${-}30}^{/circ}$，东经10°$10{}^{/circ}$至西经340°$340{}^{/circ}$）的54个样本数据集（直径为2.77-10.00千米的陨石坑）进行了统计空间点分析。

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来源期刊

Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

5.50

自引率

3.20%

发文量

285

审稿时长

19 weeks

期刊介绍： Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.